Electric generator



Dec. 4, 1923. 1,476,394 c. w. DAKE ELECTRIC GENERATOR Original Filed Aug. 20. 1919 2 Sheets-Sheet 1 Per/100ml 17090:!

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V C W DAKE ELECTRIC GENERATOR Original Filed Au 2O 1919 2 Sheets-Sheet 2 Witness Patented Dec. 4, 1923.

UNITED STATES, PATE l 1,476,394 NT ornca.

CHARLES W. DAKROF CHICAGO, ILLINOIS A SSIGNOB TO THE PYLE-NA'I'IONAL COH- PANY, OI CHICAGO, ILLINOIS, A CORPORATION OF NEW JERSEY.

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Original application m August 20, 1919. Serial No. 319,051. mvide'd'and mapplication mini 51,

To all w-Iwmz't may concern: I Be it known that 1, CHARLES W. DARE, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented a certain new and useful Improvement in Electric Generators, of which the following is a specification, said application being. a division of-my Patent No. 1,446,787.

My invention relates to-improvementsin electric nerators and has for one object to provife a new and improved form of electric generatorwhich will be peculiarly efficient and satisfactory in operation and which in an induction type of generator, will enable the obtaining of very high current output from a peculiarly small type and size of generator.

I have illustrated a. generator which can be used in connection with a motor generator set and its peculiarities of design result. therefrom. Obviousl however, such a nerator as this might be used in any desired connection and changes in design and proportion of parts mi ht be necessary.

I My invention is illustrated more or less diagrammatically in the accompanying drawings wherein;

Figure 1 shows a longitudinal cross section;

Figure 2 is a section along the line 22 of Figure '1;

Figure 3 is a similar section with the position of the parts sli htly changed;

Like parts are in icated by like characters throughout the drawings.

As above sug ted, 'my enerator is illustrated a brofe n away rom the other parts of a motor generator set in which it mi ht be located. 4

is a cylindrical field magnet having a lurality of rmanent magnetic poles C C, C, C and armature coils C and C associated with these pole pieces. This forms the field'assembly or unit which is supported in the housing by the flanges C and C, the flange C slidably engages the annular bearin surface C on the rib C" and the flange is rigidly held against the rib C by a bearing housin support C. Thus the field magnet assem l is anchored in place only at one end an is free to slide at the other end while held in central position, this change in size and shape,

' caused by generators, a fixed and a movable 1920. Serial No. 888,185.

expansion and contraction of any of the parts will not in any way affect the operation.

E i the rotor. It is more or less maltese l cross shaped in cross section and ismade u of a lar number of very thin laminates steel or II'OIl platesstrung upon the sleeve E. It rotates in a closed smooth walled cylindrical chamber formed by magnet poles and filler blocks inserted between them. At either end of.the rotor E is a washer ER These washers form a closure for each end of the shallow channels formed in the face of the rotor and illustrated in Figures 2 and 3. The washers, by

closing the ends of these channels prevent circulation of air longitudinally away from the ends of the rotor and thereby prevent the formation of eddy currents. The air, caught up in these smooth channels is whirled around and around within the.

smooth walled cylindrical chamber and does not escape from it. There thus is a minimum of power loss fromceddy currents.

The dynamo here shown is an inductor generator used here for the purpose of obtaining the smallest possible nerator for the current output required. uch a nerator comprises like substantially all other art.

The rotor is located within a. cylindrical pocket having smooth walls formed partially by the poleplece and partiall by the spacing plugs or shields between t em. The rotor itself is a smooth cylinder except for the thin longitudinal channels in its face located in opposition to the pole ieces and the closing rings or washers at eit er end of these channels, closingthem off so that there is a minimum of resistance caused by windage, eddy currents, and the like.

I claim 1. An electric generator comprising a rotor having a plurality of shallow longitudinal slots in the periphery thereof, flanges closing the ends of the slots and having substantially the same diameter as the balance of the rotor, field magnets surrounding the slotted portion of the rotor, there being magnets and the periphery of the rotor.

the field 2. An electric generator comprising a rotor having a lurality of shallow longitudinal slots in t e periphery thereof, flanges closing the ends of the slots and having substantially the same diameter as the balance of the rotor, field magnets surrounding the slotted portion of the rotor, there being working clearance between the faces ofthe magnets and the periphery of the rotor, a non-magnetic filling interposed between the field poles and adapted to complete and form a cylindrical chamber surrounding the rotor.

3. An electric generator comprising a plurality of field magnet poles, non-magnetic 20 preventing longitudinal displacement of air therethrough, said means being mounted for rotation wlth the rotor.

- 4. An electric generator comprising a plutation therein, there being only working K clearance between the walls of the chamber and the rotor, and means located at'the opposed ends of the cylindrical chamber for preventing longitudinal displacement of air therethrough, aid means comprising flanges on the rotor whose diameter is sufficiently less than the diameter of the cylinder to permit clearance in operation.

Signed at Chicago, county of Cook and State of Illinois, this 14th day of May,

CHARLES W. DAKE. 

